Answer
Roger Federer defeated Marcos Baghdatis in the 2006 Australian Open final. Federer, the top seed, won in straight sets, 5-7, 7-5, 6-0, 6-2. It was Federer's eighth Grand Slam title, and his third Australian Open title. Baghdatis, the unseeded Cypriot, had upset several top players on his way to the final, including Andy Roddick and David Nalbandian.